Thiazoleazo dyes having a coupling component of the diphenylamine series

ABSTRACT

Thiazoleazo dyes useful for dyeing or printing textile fibers have the formula  (* CHEMICAL STRUCTURE *)  where R1 is hydrogen, substituted or unsubstituted C1-6-alkyl, halogen, substituted or unsubstituted C1-C6-alkoxy, substituted or unsubstituted C1-C6alkythio, substituted or unsubstituted phenylthio, C1-C6-alkylsulfonyl, substituted or unsubstituted phenylsulfonyl or C1-C4-alkoxycarbonyl, R2 is cyano, C1-C4-alkanoyl, benzoyl, C1-C6alkylsulfonyl, substituted or unsubstituted phenylsulfonyl or a radical of the formula -CH=T, where T is the radical of an acidic CH compound, R3 is hydrogen, substituted or unsubstituted C1-6-alkoxy, C1-C4-alkoxycarbonyl, carbamoyl or mono- or di-C1-C4-alkylcarbamoyl, R4 is C1-C6-alkyl, substituted or unsubstituted C1-C6-alkoxy, substituted or unsubstituted C1-C4-alkoxycarbonyloxy substituted or unsubstituted phenoxycarbonyloxy, substituted aminocarbonyloxy, substituted or unsubstituted C1-C4-alkanoyloxy, substituted or unsubstituted C1-C4-alkanoylamino or substituted or unsubstituted phenyl, R5 is hydrogen, substituted or unsubstituted C1-C10-alkyl, or substituted or unsubstituted C3-C5-alkenyl, and R6 and R7 are hydrogen, halogen, cyano, substituted or unsubstituted C1-C10-alkyl, amino or mono- or di-C1-C4-alkylamino.

The present invention relates to novel thiazoleazo dyes of the formula I ##STR2## where R¹ is hydrogen, C₁ -C₆ -alkyl, C₁ -C₆ -monooxaalkyl C₁ -C₆ -dioxadlkyl, halogen, unsubstituted or phenyl-substituted C₁ -C₆ -alkoxy, unsubstituted or phenyl-substituted C₁ -C₆ -alkylthio, substituted or unsubstituted phenylthio, C₁ -C₆ -alkylsulf onyl, substituted or unsubstituted phenylsulfonyl or C₁ -C₄ -alkoxycarbonyl,

R² is cyano, C₁ -C₄ -alkanoyl, benzoyl, C₁ -C₆ -alkylsulfonyl, substituted or unsubstituted phenylsulfonyl or a radical of the formula --CH═T, where T is the radical of an acidic CH compound,

R³ is hydrogen, C₁ -C₆ -alkoxy, which may be hydroxyl- or C₁ -C₄ -alkoxy-substituted, C₁ -C₄ -alkoxycarbonyl, carbamoyl or mono- or di-C₁ -C₄ -alkylcarbamoyl,

R⁴ is C₁ -C₆ -alkyl, C₁ -C₆ -alkoxy, which may be hydroxyl-, C₁ -C₄ -alkoxy- or C₁ -C₄ -alkanoyloxy-substituted, C₁ -C₄ -alkoxycarbonyloxy, which may be hydroxyl- or C₁ -C₄ -alkoxy-substituted, substituted or unsubstituted phenoxycarbonyloxy, a radical of the formula ##STR3## where X¹ and X² are identical or different and each is independently of the other C₁ -C₆ -alkyl, which may be C₁ -C₄ -alkoxy-substituted, or X¹ and X² together with the nitrogen atom joining them together are a five- or six-membered saturated heterocyclic radical with or without further hetero atoms, unsubstituted or hydroxyl-, chlorine-, cyano-, C₁ -C₄ -alkoxy- or phenoxy-substituted C₁ -C₄ -alkanoyloxy, unsubstituted or hydroxyl-, chlorine-, cyano-, C₁ -C₄ -alkoxy-, phenoxy- or C₁ -C₄ -alkanoyloxy-substituted C₁ -C4-alkanoylamino or unsubstituted or chlorine-, cyano-, nitro-, C₁ -C₄ -alkyl-, C₁ -C₄ -alkoxy-, C₁ -C₄ -alkoxycarconyl- or C₁ -C₄ -alkylsulfonyl-substituted phenyl,

R⁵ is hydrogen, C₁ -C₁₀ -alkyl, which may be hydroxyl-, halogen-, cyano-, C₁ -C₄ -alkanoyloxy- or C₁ -C₄ -alkoxycarbonyl-substituted and may be interrupted by from 1 to 3 oxygen atoms in ether function, or unsubstituted or hydroxyl-, halogen-, C₁ -C₄ -alkoxy- or C₁ -C₄ -alkanoyloxy-substituted C₃ -C₄ -alkenyl, and

R⁶ and R⁷ are identical or different and each is independently of the other hydrogen, halogen, cyano, C₁ -C₁₀ -alkyl, which may be hydroxyl-, halogen-, cyano-, C₁ -C₄ -alkanoyloxy- or C₁ -C₄ -alkoxycarbonyl-substituted and can be interrupted by from 1 to 3 oxygen atoms in ether function, C₁ -C₄ -alkoxy, which may be hydroxyl- or C₁ -C₄ -alkanoyloxy-substituted, amino or mono- or di-C₁ -C₄ -alkylamino,

and to the use thereof for dyeing or printing textile fibers.

DE-A-2 113 154 discloses azo dyes which are similar to those of the abovementioned formula I but which are based on 2-amino-4-phenylthiazoles as diazo component.

Furthermore, DE-A-3 108 077 describes azo dyes where the diazo component is 2-amino-4-chloro-5-formylthiazole or a condensation product thereof with an acidic CH compound and where the coupling component is an aniline derivative.

It is an object of the present invention to provide novel thiazoleazo dyes which possess an advantageous balance of application properties.

We have found that this object is achieved by the hereinbefore more particularly identified thiazoleazo dyes of the formula I.

Any alkyl or alkenyl appearing in the abovementioned formula I may be either straight-chain or branched.

Any substituted phenyl appearing in the abovementioned formula I may have as substituents, unless otherwise stated, for example C₁ -C₄ -alkyl, halogen, especially chlorine or bromine, or C₁ -C₄ -alkoxy. The phenyl radicals have in general from 1 to 3 substituents.

R¹, R⁴, R⁵, R⁶, R⁷, X¹ and X² are each f or example methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, pentyl, isopentyl, neopentyl, tert-pentyl, hexyl or 2-methylpentyl.

R⁵, R⁶ and R⁷ may each also be for example hexyl, heptyl, octyl, 2-ethylhexyl, nonyl or decyl.

R¹, R⁵, R⁶, R⁷, X¹ and X² may each also be for example 2-methoxyethyl, 2-ethoxyethyl, 2-propoxyethyl, 2-butoxyethyl, 2-isobutoxyethyl, 2- or 3-methoxypropyl, 1-methoxyprop-2-yl, 2- or 3-ethoxypropyl or 2- or 3-propoxypropyl.

R¹, R⁵, R⁶ and R⁷ may each also be for example 3,6-dioxaheptyl, 3,6-dioxaoctyl or 4,7-dioxaoctyl.

R⁵, R⁶ and R⁷ may each also be for example 4,7-dioxanonyl, 4,8-dioxadecyl, 4,6-dioxaundecyl, 3,6,9-trioxaundecyl, 4,7,10-trioxaundecyl or 4,7,10-trioxadodecyl.

R¹ may also be for example methylthio, ethylthio, propylthio, isopropylthio, butylthio, isobutylthio, pentylthio, hexylthio, benzylthio, 1- or 2-phenylethylthio, phenylthio, 2-methylphenylthio, 2-methoxyphenylthio, 2-chlorophenylthio, benzyloxy or 1- or 2-phenylethoxy.

R¹ and also R³, R⁴, R⁶ and R⁷ may each also be for example methoxy, ethoxy, propoxy, isopropoxy, butoxy, isobutoxy, sec-butoxy, pentyloxy, isopentyloxy, neopentyloxy, tert-pentyloxy, hexyloxy or 2-methylpentyloxy.

R¹, R⁶ and R⁷ may each also be for example fluorine, chlorine or bromine.

R¹ and R² may each also be for example methylsulfonyl, ethylsulfonyl, propylsulfonyl, isopropylsulfonyl, butylsulfonyl, isobutylsulfonyl, sec-butylsulfonyl, pentylsulfonyl, isopentylsulfonyl, neopentylsulfonyl, hexylsulfonyl, phenylsulfonyl, 2-methylphenylsulfonyl, 2-methoxyphenylsulfonyl or 2-chlorophenylsulfonyl.

R¹ and R³ may each also be for example methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, isobutoxycarbonyl or secbutoxycarbonyl.

R³, R⁴, R⁶ and R⁷ may each also be for example 2-hydroxyethoxy, 2- or 3-hydroxypropoxy, 2- or 4-hydroxybutoxy, 5-hydroxypentyloxy or 6-hydroxyhexyloxy.

R³ and R⁴ may each also be for example 2-methoxyethoxy, 2-ethoxyethoxy, 2- or 3-methoxypropoxy, 2- or 3-ethoxypropoxy, 2- or 4-methoxybutoxy, 2- or 4-ethoxybutoxy, 5-methoxypentyloxy, 5-ethoxypentyloxy, 6-methoxyhexyloxy or 6-ethoxyhexyloxy.

R³ may also be f or example mono- or dimethylcarbamoyl, mono- or diethylcarbamoyl, mono- or dipropylcarbamoyl, mono- or diisopropylcarbamoyl, mono- or dibutylcarbamoyl or N-methyl-N-ethylcarbamoyl.

R⁴, R⁶ and R⁷ may each also be for example 2-acetyloxyethoxy, 2- or 3-acetyloxypropoxy, 2- or 4-acetyloxybutoxy, 5-acetyloxypentyloxy or 6-acetyloxyhexyloxy.

R⁵, R⁶ and R⁷ may each also be for example 2-hydroxyethyl, 2-chloroethyl, 2-cyanoethyl, 2-acetyloxyethyl, 2-methoxycarbonylethyl, 2-ethoxycarbonylethyl, 2- or 3-hydroxypropyl, 2- or 3-chloropropyl, 2- or 3-cyanopropyl, 2- or 3-acetyloxypropyl, 2- or 3-cyanopropyl, 2- or 3-acetyloxypropyl, 2- or 3-cyanopropyl, 2- or 3-acetyloxypropyl, 2- or 3-methoxycarbonylpropyl, 2- or 3-ethoxycarbonylpropyl, 2- or 4-hydroxybutyl, 2- or 4-chlorobutyl, 2- or 4-cyanobutyl, 2- or 4-acetyloxybutyl, 2- or 4-methoxycarbonylbutyl or 2- or 4-ethoxycarbonylbutyl.

R⁵ may also be for example prop-2-en-l-yl, but-2-en-1-yl, 2-methylprop-2-en-l-yl, 2-ethylprop-2-en-l-yl, 2-methylbut-2-en-l-yl, 3-chloroprop-2-en-l-yl, 4-chlorobut-2-en-l-yl, 4-hydroxybut-2-en-l-yl, 4-methoxybut-2-en-1-yl or 4-acetyloxybut-2-en-1-yl.

R⁶ and R⁷ may each also be f or example mono- or dimethylamino, mono- or diethylamino, mono- or dipropylamino, mono- or dibutylamino or N-methyl-N-ethylamino.

R⁴ may also be for example methoxycarbonyloxy, ethoxycarbonyloxy, propoxycarbonyloxy, isopropoxycarbonyloxy, butoxycarbonyloxy, 2-hydroxyethoxycarbonyloxy, 2-methoxyethoxycarbonyloxy, 2-ethoxyethoxycarbonyloxy, phenoxycarbonyloxy, 2-methylphenoxycarbonyloxy, 2-methoxyphenoxycarbonyloxy, 2-chlorophenoxycarbonyloxy, formyloxy, acetyloxy, propionyloxy, butyryloxy, hydroxyacetyloxy, chloroacetyloxy, cyanoacetyloxy, methoxyacetyloxy, ethoxyacetyloxy, phenoxyacetyloxy, formylamino, acetylamino, propionylamino, butyrylamino, hydroxyacetylamino, chloroacetylamino, cyanoacetylamino, methoxyacetylamino, ethoxyacetylamino, phenoxyacetylamino, 2-, 3- or chlorophenyl, 2,4-dichlorophenyl, 2-, 3- or 4-cyanophenyl, 2-, 3- or 4-methylphenyl, 2,4-dimethylphenyl, 4-isopropylphenyl, 2-, 3- or 4-methoxyphenyl, 2,4-dimethoxyphenyl, 2-, 3- or 4-methoxycarbonylphenyl, 2-., 3- or 4-ethoxycarbonylphenyl, 2-, 3- or 4-methylsulfonylphenyl, 2-, 3- or 4-ethylsulfonylphenyl or 2-, 3- or 4-nitrophenyl.

When X¹ and X², together with the nitrogen atom joining them together, form a five- or six-membered saturated heterocyclic radical with or without further hetero atoms, the radical in question may be for example pyrrolidinyl, piperidinyl, morpholinyl, piperazinyl or N-C₁ -C₄ -alkylpiperazinyl, such as N-methyl- or N-ethylpiperazinyl.

R² may also be for example formyl, acetyl, propionyl or butyryl.

When R² is --CH═T, where T is derived from an acidic CH compound H₂ T, possible acidic CH compounds H₂ T are for example compounds of the formulae IIa to IIf ##STR4## where L¹ is cyano, nitro, C₁ -C₄ -alkanoyll substituted or unsubstituted benzoyll C₁ -C₄ -alkylsulfonyl, substituted or unsubstituted phenylsulfonyl, carboxyl, C₁ -C₄ -alkoxycarbonyl, phenoxycarbonyl, carbamoyl, mono- or di-C₁ -C₄ -alkyl carbamoyl, substituted or unsubstituted phenylcarbamoyl, substituted or unsubstituted phenyl, benzothiazol-2-yl, benzimidazol-2-yl, 5-phenyl-1,3,4-thiadiazol-2-yl or 2-hydroxyquinoxalin-3-yl,

L² is C₁ -C₄ -alkyl or C₁ -C₄ -alkoxyl

L³ is C₁ -C₄ -alkoxycarbonyl, phenylcarbamoyl or benzimidazol-2-yl,

L⁴ is hydrogen or C₁ -C₆ -alkyl,

L⁵ is hydrogen, C₁ -C₄ -alkyl or phenyl, and

L⁶ is C₁ -C₄ -alkyl.

A particular mention must go to the radical of the formula IIa or IIb where L¹ is cyano, C₁ -C₄ -alkanoyl or C₁ -C₄ -alkoxycarbonyl, L² is C₁ -C₄ -alkyl or C₁ --C₄ -alkoxy and L³ is C₁ -C₄ -alkoxycarbonyl.

A particular mention must go to the radical of the formula IIa or IIb where L¹ is cyano or C₁ -C₄ -alkoxycarbonyl, L² is C₁ -C₄ -alkoxy and L³ is C₁ -C₄ -alkoxycarbonyl.

Preference is given to thiazoleazo dyes of the formula I where

R¹ is chlorine, bromine, C₁ -C₄ -alkoxy, C₁ -C₄ -alkylthio, phenylthio, C₁ -C₄ -alkylsulfonyl, phenylsulfonyl or C₁ -C₄ -alkoxycarbonyl,

R² iscyano, formyl or a radical of the formula ##STR5## where L¹ is cyano, C₁ -C₄ -alkanoyl or C₁ -C₄ -alkoxycarbonyl, L² is C₁ -C₄ -alkyl or C₁ -C₄ -alkoxy, and L³ is C₁ -C₄ -alkoxycarbonyl,

R³ is hydrogen or C₁ -C₆ -alkoxy, which may be hydroxyl- or C₁ -C₄ -alkoxy-substituted,

R⁴ is C₁ -C₆ -alkoxy, which may be hydroxyl-, C₁ -C₄ -alkoxy- or C₁ --C₄ -alkanoyloxy-substituted, a radical of the formula ##STR6## where X¹ and X² are each as defined in claim 1, or C₁ -C₄ -alkanoylamino, which may be hydroxyl-, cyano- or C₁ -C₄ -alkoxy-substituted,

R⁵ is hydrogen, C₁ -C₆ -alkyl, which may be hydroxyl- or C₁ -C₄ -alkanoyloxy-substituted and can be interrupted by 1 or 2 oxygen atoms in ether function, and

R⁶ and R⁷ are each independently of the other hydrogen, halogen, C₁ -C₄ -alkyl, which may be hydroxyl- or C₁ -C₄ -alkanoyloxy-substituted, or C₁ -C₆ -alkoxy, which may be hydroxyl- or C₁ -C₄ -alkanoyloxy-substituted.

Particular preference is given to thiazoleazo dyes of the formula I where

R¹ is chlorine, phenylsulfonyl or C₁ -C₄ -alkoxycarbonyl,

R² is cyano, formyl or a radical of the formula ##STR7##

where L¹ is cyano or C₁ -C₄ -alkoxycarbonyl, L² is C₁ -C₄ -alkoxy, and L³ is C₁ -C₄ -alkoxycarbonyl,

R³ is hydrogen or C₁ -C₆ -alkoxy, which may be hydroxyl- or C₁ -C₄ -alkoxy-substituted,

R⁴ is C₁ -C₆ -alkoxy, which may be hydroxyl-, C₁ -C₄ -alkoxy- or C₁ -C₄ -alkanoyloxy-substituted, C₁ -C₆ -dialkylaminocarbonyloxy or unsubstituted or C₁ -C₄ -alkoxysubstituted C₁ -C₄ -alkanoylamino,

R⁵ is hydrogen or C₁ -C₄ -alkyl, which may be substituted by hydroxyl and interrupted by an oxygen atom in ether function,

R⁶ is hydrogen, chlorine, bromine, C₁ -C₄ -alkyl, which may be hydroxyl-substituted, or C₁ -C₆ -alkoxy, which may be hydroxyl-substituted, and

R⁷ is hydrogen or C₁ -C₆ -alkyl, which may be hydroxyl-substituted.

Of particular interest are thiazoleazo dyes of the formula I where R¹ is chlorine and R² is cyano or formyl.

Also of particular interest are thiazoleazo dyes of the formula I where

R³ is hydrogen or C₁ -C₄ -alkoxy, in particular methoxy, and

R⁴ is C₁ -C₄ -alkanoylamino, in particular acetylamino, or hydroxyl- or C₁ -C₄ -alkoxy-substituted C₁ -C₄ -alkoxy, in particular 2-hydroxyethoxy.

Also of particular interest are thiazoleazo dyes of the formula I where

R⁵ is hydrogen or unsubstituted or hydroxyl-substituted C₁ -C₄ -alkyl,

R⁶ is hydrogen, and

R⁷ is unsubstituted or hydroxyl-substituted C₁ -C₄ -alkyl or unsubstituted or hydroxyl-substituted C₁ -C₄ -alkoxy.

The preparation of the thiazoleazo dyes of the formula I can be carried out in a conventional manner. For example, the amine of the formula III ##STR8## wherein R¹ and R² are each as defined above, can be converted in a conventional manner into the diazonium salt and this diazonium salt can be coupled in a conventional manner with a diphenylamine of the formula IV ##STR9## where R³, R⁴, R⁵, R⁶ and R⁷ are each as defined above.

However, it is also possible to react diazonium salts of diazo components of the formula IIIa ##STR10## where R¹ is as defined above, with the diphenylamines of the formula IV to give the azo dyes of the formula I (Z=formyl) and optionally condensing the resulting dyes with compounds of the formula H₂ T in a conventional manner.

The starting compounds III and IV are known per se or can be prepared by methods known per se (eg. Houben-Weyl, Methoden der Organischen Chemie, Volume 10/3, DE-A-3 015 212, DE-A-2 329 388, DE-A-2 851 514, EP-A-139 444, DE-A-2 713 573, DE-A-3 412 293 or US-A-4 324 899).

It is also possible to use the amines of the formula III and the phenols of the formula V ##STR11## where R³ and R⁴ are each as defined above and X is C₁ -C₆ -alkyl, phenylsulfonyl, 4-nitrophenylsulfonyl or C₁ -C₄ -alkanoyl, to prepare the azo dye of the formula VI ##STR12## where R¹, R², R³, R⁴ and X are each as defined above, and then to subject this azo dye to a nucleophilic substitution reaction with an aniline derivative of the formula VII ##STR13## where R⁶ and R⁷ are each as defined above (see for example EP-A-237 910).

The thiazoleazo dyes of the formula I according to the present invention are advantageously suitable for use. as disperse dyes for dyeing or printing textile fibers, in particular polyesters, but also fibers of cellulose esters, polyamides or blend fabrics composed of polyesters and cellulose fibers.

To obtain a favorable color buildup, it can be advantageous in some cases to dye with mixtures of the dyes of the formula I with one another.

The novel thiazoleazo dyes have excellent dyeing properties. Applied by the commonly known high temperature dyeing method, they produce, in particular on polyesters, violet, blue or navy dyeings of high color strength which have very good fastness properties, in particular a good light fastness and a good fastness to dry heat setting and pleating.

The thiazoleazo dyes according to the present invention are also advantageous for transfer from a so-called transfer to plastic-coated paper by means of an energy source (see for example EP-A-416 434).

The invention will now be more particularly described by way of example.

EXAMPLES Example 1 ##STR14##

8 g (0.05 mol) of 2-amino-3-cyano-4-chloro-5-formylthiazole were stirred in 60 ml of 85% by weight sulfuric acid at not more than 30° C. 16.6 g of nitrosylsulfuric acid (11.5% by weight of N₂ O₃) were added dropwise at from 0° to 5° C. in the course of 30 minutes. This mixture was then stirred at that temperature for a further 2 hours.

The resulting diazonium salt solution was gradually added dropwise at from 0° to 5° C. to a solution of 13.5 g (0.05 mol) of N-phenyl-N-2-hydroxyethyl-3-acetylaminoaniline in 25 ml of N,N-dimethylformamide, 100 ml of water, 20 ml of dilute hydrochloric acid, 0.5 g of amidosulfuric acid and 300 g of ice.

Thereafter the precipitated dye was filtered off, washed neutral and dried. 21 g of dye were obtained. It dyes polyester staple fiber fabric in a navy shade.

Example 2 ##STR15##

1.7 g of the dye of Example 1 were dissolved in 100 ml of propanol and 20 ml of N,N-dimethylformamide and were mixed with 0.2 g of sodium acetate. 1.43 g of butyl cyanoacetate were added to the solution, and the mixture was stirred at 25° C. for 12 hours. The resulting solution was added to 200 ml of ice-water, and the precipitated dye was filtered off with suction, washed with water and dried at 50° C. under reduced pressure. This left 1.2 g of dye of melting point 124° C., UV_(max) (acetone)=599 nm (ε 37,000), which dyes polyester fibers in a fast navy shade.

The same method gives the dyes listed below in Table 1.

                                      TABLE 1                                      __________________________________________________________________________      ##STR16##                                                                     example                                                                              R.sup.1                                                                              R.sup.2    R.sup.3                                                                               R.sup.4   R.sup.5 R.sup.6 R.sup.7                __________________________________________________________________________      3    Cl    CHO        H      NHCOC.sub.2 H.sub.5                                                                      C.sub.2 H.sub.4 OH                                                                     H       H                       4    Cl    CHO        H      NHCOCH.sub.3                                                                             H       H       H                       5    Cl    CHC(CN)CO.sub.2 C.sub.4 H.sub.9                                                           H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OH                                                                     H       H                       6    Cl    CHO        H      NHCOCH.sub.2 OCH.sub.3                                                                   C.sub.2 H.sub.4 OH                                                                     4-OC.sub.2 H.sub.5                                                                     H                       7    Cl    CHO        COOMe  NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OCOCH.sub.3                                                            4-OCH.sub.3                                                                            3-CH.sub.3              8    Cl    CHO        H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.5                                                                        4-C.sub.2 H.sub.5                                                                      H                       9    Cl    CHC(CN).sub.2                                                                             H      NHCOCH.sub.3                                                                             C.sub.4 H.sub.9                                                                        4-CH(CH.sub.3).sub.2                                                                   H                      10    Cl    CHC(CN).sub.2                                                                             H      OCH.sub.3 H       2-CH.sub.3                                                                             H                      11    Cl    CHC(CN)CO.sub.2 C.sub.2 H.sub.5                                                           H      OC.sub.2 H.sub.4 OH                                                                      C.sub.2 H.sub.4 OH                                                                     3-CH.sub.3                                                                             4-N(C.sub.2                                                                    H.sub.5).sub.2         12    Cl    CN         H      NHCOC.sub.2 H.sub.5                                                                      C.sub.2 H.sub.4 OH                                                                     4-CH.sub.3                                                                             H                      13    Cl    CN         COOC.sub.2 H.sub.5                                                                    NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OH                                                                     H       H                      14    CH.sub.3                                                                             CHO        H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OH                                                                     H       H                      15    Cl    CN         H      NHCOCH.sub.2 OC.sub.2 H.sub.5                                                            C.sub.2 H.sub.4 OH                                                                     H       4-OC.sub.2                                                                     H.sub.5                16    CO.sub.2 C.sub.2 H.sub.5                                                             CO.sub.2 C.sub.2 H.sub.5                                                                  COOCH.sub.3                                                                           NHCOC.sub.4 H.sub.9                                                                      C.sub.2 H.sub.4 OH                                                                     4-C.sub.2 H.sub.4                                                                      HH                     17    CO.sub.2 C.sub.2 H.sub.5                                                             CO.sub.2 C.sub.2 H.sub.5                                                                  H      NHCOC.sub.4 H.sub.5                                                                      C.sub.2 H.sub.4 OH                                                                     4-Cl    H                      18    CO.sub.2 CH.sub.3                                                                    CN         H      NHCOC.sub.2 H.sub.5                                                                      CH.sub.2 CHCHCl                                                                        H       4-OC.sub.2                                                                     H.sub.4 OH             19    CO.sub.2 C.sub.2 H.sub.5                                                             CN         H      OCOC.sub.2 H.sub.5                                                                       C.sub.2 H.sub.4 OH                                                                     H       4-OC.sub.2                                                                     H.sub.5                20    CO.sub.2 CH.sub.3                                                                    CN         H      OCON(CH.sub.3).sub.2                                                                     C.sub.3 H.sub.7                                                                        4-OC.sub.3 H.sub.7                                                                     H                      21    CH.sub.3                                                                             CO.sub.2 CH.sub.3                                                                         OCH.sub.3                                                                             NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OH                                                                     4-C.sub.2 H.sub.4                                                                      HH                     22    CH.sub.3                                                                             CO.sub.2 CH.sub.3                                                                         OCH.sub.3                                                                             OCOC.sub.2 H.sub.5                                                                       H       H       H                      23    CH.sub.3                                                                             COCH.sub.3 H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OCOCH.sub.3                                                            H       H                      24    C.sub.6 H.sub.5 S                                                                    CHO        H      NHCOCH.sub.3                                                                             H       H       H                      25    C.sub.6 H.sub.5 S                                                                    CHO        H      OC.sub.2 H.sub.4 OH                                                                      C.sub.2 H.sub.4 OH                                                                     4-OC.sub.2 H.sub.4                                                                     HH                     26    C.sub.6 H.sub.11 S                                                                   CHO        H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OCOCH.sub.3                                                            H       H                      27    C.sub.4 H.sub.9 S                                                                    CHO        H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OH                                                                     H       H                      28    C.sub.6 H.sub.5 SO.sub.2                                                             CHO        H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OCH.sub.3                                                              H       H                      29    H     CN         H      NHCOCH.sub.3                                                                             H       4-CH.sub.3                                                                             H                      30    C.sub. 2 H.sub.4 OCH.sub.3                                                           CHO        H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OH                                                                     H       H                      31    OC.sub.2 H.sub.5                                                                     CN         H      OCON(CH.sub.3).sub.2                                                                     C.sub.3 H.sub.7                                                                        3-CH.sub.3                                                                             4-CH.sub.3             32    OC.sub.2 H.sub.5                                                                     CHO        H      NHCOCH.sub.2 OCH.sub.3                                                                   C.sub.2 H.sub.4 OCH.sub.3                                                              4-OCH.sub.3                                                                            3-CH.sub.3             33    Cl    C.sub.2 H.sub.5 SO.sub.2                                                                  CO.sub.2 C.sub.2 H.sub.5                                                              NHCOC.sub.2 H.sub.5                                                                      C.sub.2 H.sub.5                                                                        4-Cl    H                      34    Cl    C.sub.6 H.sub.5 CO.sub.2                                                                  CO.sub.2 CH.sub.3                                                                     NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OH                                                                     4-Cl    H                      35    Cl    CHO        CO.sub.2 CH.sub.3                                                                     OC.sub.2 H.sub.4 OH                                                                      H       3-N(C.sub.2 H.sub.5).sub.2                                                     2       4-CH.sub.3             36    Cl    CHO        CON(C.sub.2 H.sub.5).sub.2                                                            NHCOCH.sub.3                                                                             H       OC.sub.2 H.sub.4 OH                                                                    H                      37    Cl    CN         COOC.sub.6 H.sub.5                                                                    NHCOCH.sub.3                                                                             H       H       H                      38    Cl    CHO        H      NHCOCH.sub.3                                                                             C.sub.2 H.sub.4 OH                                                                     4-OC.sub.2 H.sub.4                                                                     HH                     __________________________________________________________________________

Example 39 ##STR17##

1.9 g of 2-(2-cyano-4,5-dimethoxyphenylazo)-4-chloro-5-cyanothiazole and 2.06 g of 4-(2-hydroxyethyl)-aniline were dissolved in 100 ml of N-methylpyrrolidinone and stirred at 120° C. for 6 hours. The solution was discharged on 500 ml of water, and the precipitate dye was filtered off, washed neutral and dried. This left 1.9 g of dye having a melting point of 213° C.

It dyes polyester fabric in a dark blue shade.

The dyes listed below in Table 2 are obtained in a similar manner.

                                      TABLE 2                                      __________________________________________________________________________      ##STR18##                                                                      ##STR19##                                                                     example                                                                             R.sup.1                                                                             R.sup.2                                                                            R.sup.3                                                                               R.sup.4                                                                               R.sup.6                                                                               R.sup.7                                                                               X                                    __________________________________________________________________________     40   Cl   CN  CO.sub.2 N(C.sub.2 H.sub.5).sub.2                                                     NHCOCH.sub.3                                                                          4-OCH.sub.3                                                                           3-CH.sub.3                                                                            CH.sub.3                             41   Cl   CN  OC.sub.2 H.sub.4 OH                                                                   OC.sub.2 H.sub.4 OH                                                                   4-C.sub.2 H.sub.4 OH                                                                  H      C.sub.2 H.sub.4 OH                   42   Cl   CN  OC.sub.2 H.sub.4 OH                                                                   OC.sub.2 H.sub.4 OCH.sub.3                                                            4-OC.sub.2 H.sub.4 OH                                                                 3-OC.sub.2 H.sub.4 OH                                                                 C.sub.2 H.sub.4 OH                   43   CO.sub.2 CH.sub.3                                                                   CN  CO.sub.2 CH.sub.3                                                                     NHCOCH.sub.3                                                                          4-OC.sub.2 H.sub.5                                                                    3-OC.sub.2 H.sub.5                                                                    COCH.sub.3                           44   CO.sub.2 CH.sub.3                                                                   CN  OCH.sub.3                                                                             NHCOC.sub.2 H.sub.5                                                                   3-CH.sub.3                                                                            4-CH.sub.3                                                                            CH.sub.3                             45   Cl   CHO OCH.sub.3                                                                             NHCOCH.sub.3                                                                          4-C.sub.2 H.sub.4 OH                                                                  H      CH.sub.3                             46   Cl   CHO OC.sub.2 H.sub.5                                                                      NHCOCH.sub.3                                                                          4-OC.sub.2 H.sub.4 OH                                                                 H      C.sub.2 H.sub.5                      47   Cl   CN  OCH.sub.3                                                                             NHCOCH.sub.3                                                                          4-C.sub.2 H.sub.5                                                                     H      CH.sub.3                             48   CO.sub.2 CH.sub.3                                                                   CN  OCH.sub.3                                                                             NHCOCH.sub.3                                                                          4-CH.sub.3                                                                            3-CH.sub.3                                                                            SO.sub.2 C.sub.6 H.sub.5             49   Cl   CHO CO.sub.2 CH.sub.3                                                                     OC.sub.2 H.sub.4 OH                                                                   4-OC.sub.2 H.sub.4 OH                                                                 H      C.sub.2 H.sub.4 OH                   50   Cl   CN  OC.sub.4 H.sub.9                                                                      NHCOCH.sub.3                                                                          4-OC.sub.2 H.sub.4 OH                                                                 H      C.sub.4 H.sub.9                      51   CH.sub.3                                                                            CHO OCH.sub.3                                                                             NHCOCH.sub. 3                                                                         4-OC.sub.2 H.sub.4 OH                                                                 H      CH.sub.3                             __________________________________________________________________________ 

We claim:
 1. A thiazoleazo dye of the formula I ##STR20## wherein R¹ is chlorine, bromine, C₁ -C₄ -alkoxy, C₁ -C₄ -alkylthio, phenylthio, C₁ -C₄ -alkylsulfonyl, phenylsulfonyl or C₁ -C₄ -alkoxycarbonyl, R² is cyano, formyl or radical of the formula ##STR21## where L¹ is cyano, C₁ -C₄ -alkanoyl or C₁ -C₄ -alkoxycarbonyl, L² is C₁ -C₄ -alkyl or C₁ -C₄ -alkoxy, and L³ is C₁ -C₄ -alkoxycarbonyl, R³ is hydrogen or C₁ -C₆ -alkoxy, which may be hydroxyl- or C₁ -C₄ -alkoxy-substituted, R⁴ is C₁ -C₆ -alkoxy, which may be hydroxyl-, C₁ -C₄ -alkoxy- or C₁ -C₄ -alkanoyloxy-substituted, a radical of the formula ##STR22## where X¹ and X² are identical or different and each is independently or the other C₁ -C₆ -alkyl, which may be C₁ -C₄ -alkoxy-substituted, or X¹ and X² together with the nitrogen atom joining them together are a five- or six-membered saturated heterocyclic radical with or without further hetero atoms, unsubstituted or hydroxyl-, chlorine-, cyano-, C₁ -C₄ -alkoxy- or phenoxy-substituted C₁ -C₄ -alkanoyloxy, unsubstituted or hydroxyl-, chlorine-, cyano-, C₁ -C₄ -alkoxy-, phenoxy- or C₁ -C₄ -alkanoyloxy-substituted C₁ -C₄ -alkanoylamino or unsubstituted or chlorine-, cyano-, nitro-, C₁ -C₄ -alkyl-, C₁ -C₄ -alkoxy-, C₁ C₄ -alkoxycarbonyl-or C₁ -C₄ -alkylsulfonyl-substituted phenyl, or C₁ -C₄ -alkanoylamino, which may be hydroxyl-, cyano- or C₁ -C₄ -alkoxy-substituted, R⁵ is hydrogen, C₁ -C₆ -alkyl, which may be hydroxyl- or C₁ -C₄ -alkanoyloxy-substituted and can be interrupted by 1 or 2 oxygen atoms in either function, and R.sup. 6 and R⁷ are each independently of the other hydrogen, halogen, C₁ -C₄ -alkyl, which may be hydroxyl- or C₁ -C₄ -alkanoyloxy-substituted, or C₁ -C₆ -alkoxy, which may be hydroxyl- or C₁ -C₄ -alkanoyloxy-substituted.
 2. A thiazoleazo dye of the formula I: ##STR23## wherein R¹ is chlorine, phenylsulfonyl or C₁ -C₄ -alkoxycarbonyl, R² is cyano, formyl or a radical of the formula ##STR24## where L¹ is cyano or C₁ -C₄ -alkoxycarbonyl, L² is C₁ -C₄ -alkoxy, and L³ is C₁ -C₄ -alkoxycarbonyl, R³ is hydrogen or C₁ -C₆ -alkoxy, which may be hydroxyl- or C₁ -C₄ -alkoxy-substituted, R⁴ is C₁ -C₆ -alkoxy, which may be hydroxyl-, C₁ -C₄ -alkoxy- or C₁ -C₄ -alkanoyloxy-substituted, C₁ -C₆ -dialkylaminocarbonyloxy or unsubstituted or C₁ -C₄ -alkoxy-substituted C₁ -C₄ -alkanoylamino, R⁵ is hydrogen, C₁ -C₄ -alkyl, which may be substituted by hydroxyl and interrupted by an oxygen atom in ether function, R⁶ is hydrogen, chlorine, bromine, C₁ -C₄ -alkyl, which may be hydroxyl-substituted, or C₁ -C₆ -alkoxy, which may be hydroxyl-substituted, and R⁷ is hydrogen or C₁ -C₄ -alkyl, which may be hydroxyl-substituted. 